首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   68452篇
  免费   2588篇
  国内免费   26篇
  71066篇
  2020年   702篇
  2019年   846篇
  2018年   1202篇
  2017年   1218篇
  2016年   1296篇
  2015年   924篇
  2014年   1128篇
  2013年   6012篇
  2012年   1965篇
  2011年   2005篇
  2010年   1303篇
  2009年   1237篇
  2008年   1839篇
  2007年   1774篇
  2006年   1638篇
  2005年   1413篇
  2004年   1341篇
  2003年   1318篇
  2002年   1305篇
  2001年   2095篇
  2000年   2005篇
  1999年   1541篇
  1998年   714篇
  1996年   776篇
  1995年   762篇
  1994年   754篇
  1993年   716篇
  1992年   1459篇
  1991年   1307篇
  1990年   1336篇
  1989年   1186篇
  1988年   1214篇
  1987年   1179篇
  1986年   1189篇
  1985年   1124篇
  1984年   1023篇
  1983年   894篇
  1982年   688篇
  1979年   1059篇
  1978年   766篇
  1975年   908篇
  1974年   932篇
  1973年   1030篇
  1972年   882篇
  1971年   821篇
  1970年   729篇
  1969年   765篇
  1968年   925篇
  1967年   823篇
  1966年   748篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
211.
212.
Context and structure in conceptual combination   总被引:8,自引:0,他引:8  
  相似文献   
213.
Two modes of learning for interactive tasks   总被引:5,自引:0,他引:5  
N A Hayes  D E Broadbent 《Cognition》1988,28(3):249-276
  相似文献   
214.
The care of the patient with cancer requires the development not only of a medical plan, but an ethical plan as well. This plan should integrate the physician's and the patient's perceptions of medical and ethical propriety. Jewish biomedical ethical principles are based on the teaching of the Old Testament and its various interpretations. In this paper, I discuss how these principles can be used to help guide the physician caring for the patient with cancer. Other ethical systems could be applied in a similar fashion.  相似文献   
215.
Processing resources and age differences in working memory   总被引:1,自引:0,他引:1  
This study investigated the performance of young and old subjects on a modified version of the working memory task developed by Baddeley and Hitch (1974). Subjects were required to verify a set of sentences of varying complexity while they repeated aloud zero, two, or four words. The older subjects took longer to verify the sentences, especially when the sentences were grammatically complex, but the effect of concurrent memory load on verification latency was the same in both groups. These results cast doubt on the notion that there is an age-related decline in one general pool of processing resources. They also suggest that older people have greater difficulty with the active processing aspects, rather than with the passive holding aspects, of working memory tasks.  相似文献   
216.
Contextual stimuli from one category increase the rated similarity of stimuli from a second category. In Experiment 1, associates of one of the members of pairs of target words increased the rated similarity of the members slightly more than did much less similar contextual stimuli. In Experiment 2, contextual category names and good exemplars increased the rated similarity of pairs of poor to medium target exemplars and were also rated as more similar to these targets than the targets were to each other. In both cases, the category names resulted in the stronger effect. This ability of contextually similar stimuli to increase rated similarity opposes the distance-density and averaging-judgmental theories of the effect of context on similarity. However, the theory that a positive association exists between the perceived similarity of stimuli and the strength of the category to which they belong explains how both contextually dissimilar and contextually similar stimuli can increase rated similarity.  相似文献   
217.
218.
The concept of heightened resilience or invulnerability in young profoundly stressed children is developed in terms of its implications for a psychology of wellness and for primary prevention in mental health. Relevant literature is reviewed, a skeletal model for studying resilience is outlined, and needed research directions are considered. The latter include expansion of the construct's nomological definitional net, inquiry into the antecedents and determinants of resilience, and the application of such generative information to frame preventive interventions for young, profoundly stressed children.  相似文献   
219.
The precaution adoption process   总被引:47,自引:0,他引:47  
This article presents a critique of current models of preventive behavior. It discusses a variety of factors that are usually overlooked-including the appearance of costs and benefits over time, the role of cues to action, the problem of competing life demands, and the ways that actual decision behavior differs from the rational ideal implicit in expectancy-value and utility theories. Such considerations suggest that the adoption of new precautions should be viewed as a dynamic process with many determinants. The framework of a model that is able to accommodate these additional factors is described. This alternative model portrays the precaution adoption process as an orderly sequence of qualitatively different cognitive stages. Data illustrating a few of the suggestions made in the article are presented, and implications for prevention programs are discussed.  相似文献   
220.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号